Cartridge-primer



J. H. GILL. Cartridge-Primer.

No. 225,591. Patented Mar 16 I880.

NITED STATES PATENT OFFICs JABEZ H. GILL, OF PHILADELPHIA, PENNSYLVANIA.

CARTRlDGE-PRIMER.

SPEGIFICATION forming part of Letters Patent No. 225,591, dated March 16, 1880, Application filed December 17, 1879.

T0 aZl w7wm it may conccm:

Be it known that I, JABEZ H. GILL, cf Philadelphia, in the county cf Philadelphia and State of Pennsylvana, have inventcd certain Improvements in Oartridge-Primers, of which the following is a specification.

My invention relates to primers for cartridges; and it consists in the employmentof an anvil consisting of a thin circular plate or disk having on one face a rib or bar, the disk serving, when the anvil is applied to the cap or primer, to cover the fulminate, and by the accuracy of its fit to protect the same against moisture, while the rib or bar serves as a support npon which to explode the fulminate.

Figure 1 represnts a face view of the open or inner side of my improved primer Fig. 2, a vertical central section of the same on the line au 90 of Fig. 1; Fig. 3, a similar view of the primer after being fired or exploded; Fig. 4:, a perspective view of the anvil detached, and Fig. 5 a sectional view of a sheil With my primer applied.

In the accompanying drawings, A represents the primer as a whole; b, the cap, and c the anvi1. 4

The cap is of the form cmmonly employed for cartridge-primers, and the anvi1 c consists of a thin disk of brass or similar stiffmetal, havin g on one face a rib or bar, (1, extending entireiy across the same, and of such thickness that when the anvil is appliedto the cap it shall corne flush With or extend beyond the front of the cap, as shown in Fig. 2. Fulminate 6 is applied to. the cap as usual, attcr which the anvil is inserted within the cap and its fiat face pressed closely against the fulminatc, as shown in Fig. 2, this operation being performed by snitable dies, and the mechanical fit of the anvilwithin the cap being fonnd in practice to be so perfect as to entirely prevent the access of moisture to the fulminatc.

The primer thus constructed is seated within the reccssof the cartridge-hcad, as shown in Fig. 5, the bar cl of the anvil bearing at its ends upon the bottom of said reccss, while the concave form of said bottom aftords a space between it and the anvil for the passage of the spark o'r flash.

When the primer is exploded or fired the thin disk of the anvil I) folds down at each side of the bar 61, as shown in Fig. 3, permittingthe flash or spark to pass freely from the primer.

While in practire the disk is found to form a water-tight covering for the fnlminate, a drop of varnish may be placed over the disk as an additional precaution.

It is apparent that the edges of the bar (1 may, if desired, be beveled or rounded off to permit the more ready passage of the spark, though the form shown is considered best; and it is also obvious that, instead of providing the disk With the straight bar or rib, the latter may be made in other forms-as, for eX- ample, With three arms radiating from the center of the disk.

If desired, tin-foil may be introduced upon the fulminate, as nsual, prior to the application of the anvil.

The anvi1 may be pressed ont in a die from solid metal, or from a rolled bar 0f T form in cross-section, the latter course being considered preferable.

I am aware that it is old t0 insert a disk of tin-foil within a cap over the fulminate, and then insert a straight bar-anvil into the cap upon and across the foil, and fasten said anvil by crimping the edge of the cap inward thereon, and this I do not claim.

My method of constructing the primer in a circular or disk form, with the anvi1 formed in one piece therewith, is advantageons not only in being cheaper to construct and easier to apply mechanically, but in that it prevents the distortion of the cap-cylinder, which must fit closely and accnrately in the cartridge-sheil in order to serve as a gascheck and prevent leakage at the base. The disk of my primer, bearin g aronnd its entire circumference against the cap, has snfficient friction t0 retain it and the anvil firm1y in place, and as it is forced to its place the disk serves to maintain the true circular form of the cap. In the insertion of the bar-anvil, on the contrary, the ends bearin g in opposite sides of the cap tend to, and actually do, distort and elongate the cap to such an extent that the gases find their way past its exterior when the cartridge is ignited.

A marked advantage of my primer arises also from the fact of the thin portion of stiff metal being sustained at the middle, in couse quence 0f Whi0h the metal yields first at the and an internal anvil, made in one piece, with out er edge, the gas being eonfined and ics aca thindisk to hold the fulminate in place-and 15 bien intenSified, and its pressure first caused a raised bar to serve as an anvil. to act against the inside of the cap, so as to 3. A bar-anvil provided with thin side por- 5 force the same outward against the walls of tiens adapted to reoam the fulminate in place the poCket in which it is seated. Within the cap or primer and. 1'30 f0ld clown Having thus described my invention, whao under the pressure of the gases, as shown and 20 I claim is described.

1.'The herein-described anvil made com- 10 plete in one piece, with a thin 3rcular disk JABEZ (TILL' and a raised bar thereon, as shown and de- Witnesses:' scribed. HENRY WERNLE,

2. The combination of a: cap or primer, A, WM. DUNGAN. 

